c# - Linq:使用不同的 IEnumerable 过滤列表

Question

我找不到如何从另一个列表数组中过滤一个数组/列表:我一直在寻找这样的东西:

IEnumerable<bool> Filter = new[] { true, true, false,true };

IEnumerable<string> Names = new[] { "a", "B", "c", "d" };

List<string> NameFiltered = Filter
    .Where(c => c == true)
    .Select(x => Names)
    .ToList();

Answer 1

一般情况下(Names 和Filter 都是IEnumerable<T>)我建议Zip :

List<string> NameFiltered = Names
  .Zip(Filter, (name, filter) => new {
    name = name,
    filter = filter, })
  .Where(item => item.filter)
  .Select(item => item.name)
  .ToList();

如果Filter实际上是一个数组 ( ..Filter = new[]... ) Where会做:

List<string> NameFiltered = Names
  .Where((name, index) => Filter[index])
  .ToList();